Unlock the Power of Object.fromEntries()
When working with key-value pairs, JavaScript developers often find themselves in need of a convenient way to convert them into objects. This is where the Object.fromEntries() method comes into play.
A Static Method with a Purpose
Object.fromEntries() is a static method, meaning it’s accessed using the class name Object. Its primary function is to create an object from a list of key-value pairs, making it an essential tool in any JavaScript developer’s toolkit.
Understanding the Syntax
The syntax of Object.fromEntries() is straightforward:
Object.fromEntries(iterable)
Here, iterable can be an array, map, or any other object that implements the iterable protocol.
Parameters and Return Value
The Object.fromEntries() method takes one parameter: an iterable containing key-value pairs. In return, it creates a new object whose properties are defined by the entries of the iterable.
Reversing the Process
Interestingly, Object.fromEntries() performs the opposite function of Object.entries(). While Object.entries() converts an object into an array of key-value pairs, Object.fromEntries() does the reverse, turning an array of key-value pairs into a fully-fledged object.
Putting it into Practice
Let’s consider an example:
const entries = [["firstName", "John"], ["lastName", "Doe"]];
const obj = Object.fromEntries(entries);
console.log(obj); // Output: { firstName: "John", lastName: "Doe" }
As you can see, we’ve successfully converted an array of key-value pairs into a usable object. This method can be applied to various scenarios, making it a valuable asset in your JavaScript development arsenal.
Further Reading
If you’re interested in learning more about working with objects and arrays in JavaScript, be sure to check out our guides on JavaScript Object.entries() and Javascript Array entries().